7.Time should be made good use ___ our lessons well.

第一make use of 是固定短语
第二learning是动名词 后面不能跟名词our lessons
所以要用 to learn

原句
TO learn our lessons well,We should make good use of time .

TO learn our lessons well是目的 ; We should make good use of time
是方法

倒装We should make good use of time 成Time should be made good use
再将目的接在后边
Time should be made good use (of to learn) our lessons well

1. A
短语 make good use of sth to do 充分利用某事去做...
这个短语的被动语态是：sth be made good use of to do

所以，
make good use of time to learn our lessons well 充分利用时间把课程学好。还可以说成：
time should be made of to learn our lessons well
所以选A

make use of sth to do

倒装了

make use of是充分利用，不可拆
to do 表示目的
明白？

a
时间应当被好好利用来吸取教训/好好学习课程。learn our lesson是make good use of 的目的，to do不定式表目的